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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bf0ca08a7272b794ca710e2183f463f3f0791e942ef44766d1b724b48ce69a' 
  AND token = 'wrVvNLsF95RiBfbTYWDKUDXNwf4bHFKEuOEN+GCnV4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}